Senate Democrats are renewing their push to keep people on terrorist watch lists from buying firearms.

Sen. Charles E. Schumer of New York led a conference call Monday along with several Democratic colleagues, including Sen. Bill Nelson, a Florida Democrat who is in Orlando where a mass shooting at a gay nightclub early Sunday morning killed 50 people including the gunman.

Schumer said the Commerce Justice Science appropriations bill is one avenue for Democrats to push their legislation barring suspected terrorists from acquiring firearms.

"That’s one possible place to add this bill," he said. "But one way or another, we’re going to push to get the terror gap bill passed."

The amendment fell when senators voted 45-54 in favor of a motion to waive the budget rules, short of the 60 votes needed. Illinois GOP Sen. Mark S. Kirk was the only Republican to cross over and vote in support of Feinstein's measure, while Democratic Sen. Heidi Heitkamp of North Dakota was the only member of her caucus to oppose it.

Multiple Republican aides noted that during last year's debate, Senate Majority Whip John Cornyn of Texas offered an alternative that would include due process protections. That measure garnered the bipartisan support of 55 senators, which was also short of the 60 votes needed.

Following the deadliest mass shooting in U.S. History in Orlando, gun issues are once again a topic of conversation from Washington to the campaign trail to the kitchen table. Follow the timeline for a recap of major laws considered by Congress since 1968, as well as relevant U.S. events.Hover over the lines to see what major laws have been considered by Congress since 1968. Hover over the squares for relevant U.S. events.